Pretty prompt and "login" conveniences

[smasher]

Here's a pretty prompt with some nice "login" conveniences.



Here's the profile, in "/jffs/etc/profile":

## there's no .login support in this busybox shell
## so use this as a test to see if this is a fresh login
## otherwise, just skip this conditional list when this file is sourced
[ ${HISTFILE} ] || {
    ## alternative test, if $HISTFILE isn't working as expected: [ ${_} == ']' ]
    ## below here, within this curly-brace list, is what's done during a fresh login
    echo
    echo "curent time: $(date)"
    ## calculate and display boot time
    echo -n "boot time:   "
    date -d@$(( $( date +%s ) - $( cut -d. -f1 < /proc/uptime ) ))
    ## display uptime and load averages
    eval "echo uptime: $(date -ud@$( cut -d. -f1 < /proc/uptime ) +'$((%s/86400)) days %H:%M:%S')"
    echo -n "load avg: "
    cut -d ' ' -f1-3 < /proc/loadavg
    echo
    ## display filesystem stats for /tmp and /jffs
    df -h /tmp /jffs
    echo
    ## display used and available space in nvram
    echo -n "nvram " ; nvram show > /dev/random
    echo
}

## set up a nice prompt
## unfortunately this version of busybox chokes on multi-line prompts
export PS1="\[\e[35m\]\h\[\e[m\] \[\e[36m\]\w\[\e[m\]\[\e[97m\] \\$\[\e[m\] "
export PS2="\e[91m>\e[m "

## add custom scripts to the PATH
PATH=${PATH}:/jffs/bin

Then add this to "/jffs/scripts/init-start", to link (or copy) it into the $HOME directory at boot:

## set up fancy prompt stuff
/bin/ln  -s  /jffs/etc/profile  /root/.profile

If needed, copy it to "~/.profile".

ln -s /jffs/etc/profile ~/.profile

Tested and working spectacularly on an AC68U.

Updating the PATH is useful for scripts like these - https://www.snbforums.com/threads/cryptographic-hash-script.59988/

Here's how this pretty-prints the uptime - https://www.snbforums.com/threads/pretty-print-uptime.59986/

Here's how this pretty-prints the boot time - https://www.snbforums.com/threads/display-boot-time.59984/

Of course the prompt can be customised to your liking, but there are limitations in busybox, so a "normal" bash prompt may not work as expected.